04-18-2008 07:01 AM - edited 03-05-2019 10:28 PM
This is driving me nuts. I'm sure the problem is starring me in the face but i need a little help.
I am working on a BSCI lab for multicasting but I have a routing problem.
Here is the setup.
R1 < - > R2 < - > SW1
R1 s1/0 connects to R2 s1/0 via serial.
R2 fa0/0 connects to a switch SW1 f1/1 via fastethernet.
SW1 has VLAN20 in its vlan database.
SW1 fa1/1 has switchport mode access, and switchport access vlan20 applied.
*SW1 has "ip default-gateway 172.16.20.2" applied
the serial link has IP of 172.16.102.0/29 with R1 on .1 and R2 on .2
The fastethernet link has an IP of 172.16.20.0/24 with R2 fa0/0 on .2
VLAN20 on SW1 has the ip of 172.16.20.4
EIGRP is setup on R1 and R2 with the following setup:
Router EIGRP 1
Network 172.16.0.0
R1 can not ping 172.16.20.4
R1 has a route to 172.16.20.0/24 via R2's serial link.
my brain(and the lab i am working on) says this should work but it doesnt.
any thoughts?
any help is greatly appreciated.
Eric
*crap, sorry had some incomplete information
Solved! Go to Solution.
04-18-2008 10:55 AM
Jon
I am thinking ip routing may be enabled in the switch, which would make ip default-gateway command irrelevant.
Eric
Can you post 'show ip route' from the switch.
HTH
Sundar
04-18-2008 07:05 AM
Eric
Is the switch a layer 2 or layer 3 switch. If layer 2 have you set the "ip default-gateway" to point 172.16.20.2.
Also can you confirm the vlan interface 20 is actually up ie.
sh ip int br
Jon
04-18-2008 07:07 AM
sorry, i forgot to include that bit. I just edited it as you posted your reply. Sorry about that.
And yes, VLAN20 shows up and up. and so does fa1/1
04-18-2008 07:08 AM
sorry, i forgot to include that bit. I just edited it as you posted your reply. Sorry about that.
And yes, VLAN20 shows up and up. and so does fa1/1
switch is a 3660 with a NM-16esw blade. layer 2
04-18-2008 07:08 AM
duplicate, sorry not my day
04-18-2008 07:13 AM
Can you
1) ping 172.16.20.4 from 172.16.20.2
2) ping 172.16.20.2 from 172.16.102.1
3) ping 172.16.102.1 from 172.16.20.2
Can you post "sh ip ro" from R1 and R2.
Jon
04-18-2008 07:34 AM
using extended pings...
1) ping 172.16.20.4 from 172.16.20.2
YES
2) ping 172.16.20.2 from 172.16.102.1
YES
3) ping 172.16.102.1 from 172.16.20.2
YES
Can you post "sh ip ro" from R1 and R2.
Sure, i took the code legend out.
R1#show ip route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
D 172.16.20.0/24 [90/20514560] via 172.16.102.2, 00:07:35, Serial1/0
C 172.16.102.0/29 is directly connected, Serial1/0
R2#show ip route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.20.0/24 is directly connected, FastEthernet0/0
C 172.16.102.0/29 is directly connected, Serial1/0
thanks Jon, i didnt expect the 3rd ping to work.
e-
04-18-2008 10:00 AM
Could it be maybe an issue with discontiguous subnets? Since the serial link is 172.16.102.0 and the fastether is 172.16.20.0...
dont know, i am grabbing at straws.
e-
04-18-2008 10:08 AM
Eric
No i don't think it's discontiguos subnets. Coudl you post the full configs for all devices. I suspect it is an issue with the switch.
Jon
04-18-2008 10:32 AM
Sure thing, here you go.
R1
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
no ip domain lookup
!
ip cef
ip audit po max-events 100
!
interface Serial1/0
bandwidth 128
ip address 172.16.102.1 255.255.255.248
serial restart-delay 0
clock rate 128000
!
router eigrp 1
network 172.16.0.0
auto-summary
!
ip classless
no ip http server
no ip http secure-server
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
login
!
!
end
R2
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
no aaa new-model
ip subnet-zero
!
no ip domain lookup
!
ip cef
ip audit po max-events 100
!
interface FastEthernet0/0
ip address 172.16.20.2 255.255.255.0
duplex full
!
interface Serial1/0
bandwidth 128
ip address 172.16.102.2 255.255.255.248
serial restart-delay 0
!
router eigrp 1
network 172.16.0.0
auto-summary
!
ip classless
no ip http server
no ip http secure-server
!
gatekeeper
shutdown
!
!
line con 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
login
!
!
end
SW1#
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname SW1
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
!
ip cef
no ip domain lookup
!
interface FastEthernet1/1
switchport access vlan 20
!
interface Vlan1
no ip address
!
interface Vlan20
ip address 172.16.20.4 255.255.255.0
!
ip default-gateway 172.16.20.2
ip http server
ip forward-protocol nd
!
control-plane
!
line con 0
line aux 0
line vty 0 4
login
!
!
end
SW1#vlan database
SW1(vlan)#show
VLAN ISL Id: 1
Name: default
Media Type: Ethernet
VLAN 802.10 Id: 100001
State: Operational
MTU: 1500
Translational Bridged VLAN: 1002
Translational Bridged VLAN: 1003
VLAN ISL Id: 20
Name: VLAN0020
Media Type: Ethernet
VLAN 802.10 Id: 100020
State: Operational
MTU: 1500
04-18-2008 10:47 AM
Eric
I have just labbed this up with 2 routers (2621XM's) and a switch (3560) and it works fine ie. i have full connectivity.
Can you post "sh cdp neigh" from the switch.
Not sure what is wrong here as configs look good.
Jon
04-18-2008 10:55 AM
Jon
I am thinking ip routing may be enabled in the switch, which would make ip default-gateway command irrelevant.
Eric
Can you post 'show ip route' from the switch.
HTH
Sundar
04-18-2008 10:59 AM
Sundar
I think you may well be right. I didn't think the NM-16esw module in a 3660 could do L3 routing.
If it fixes it i'll rate :-)
Edit - just looked it up and it can.
Jon
04-18-2008 11:02 AM
DOH!
SW1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.20.0 is directly connected, Vlan20
SW1#
so... issue a "no ip routing" on SW1?
e-
04-18-2008 11:03 AM
Yep
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